import re
exp_time = u'可以大大后天'

rule = u"大*大后天"
pattern = re.compile(rule)
match = pattern.search(exp_time)
print(f'match{match}')
if match is not None:
    rule = u"大"
    pattern = re.compile(rule)
    match = pattern.findall(exp_time)
    print(match)
    print(f'rule1  shiftdays  {2 + len(match)}')
